JP2018151481A - Display device and control method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device with which it is possible for a user to easily grasp the distribution of external light reflected in the screen in order to suppress the influence of the external light reflected in the screen.SOLUTION: The display device of the present invention is characterized by comprising: a backlight 10 for irradiating light; a liquid crystal panel 20 for allowing the light irradiated from the backlight 10 to pass through and displaying an image on the screen; an optical sensor 30, arranged in the backlight 10, for detecting at least one of the luminance and color of external light having passed through the liquid crystal panel 20; and distribution image generation means 102 for generating a distribution image that indicates the distribution of external light on the basis of the detection result of the optical sensor 30 and outputting the distribution image.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a display device and a control method thereof.

  When a user views an image displayed on a display device, the user may perceive a color different from the color displayed on the screen of the display device due to reflection of external light irradiated on the screen of the display device. is there. In particular, in a monitor display device used in the field of outdoor photography, the brightness of external light is strong and is easily affected by reflection.

  The video signal processing apparatus described in Patent Literature 1 discloses that video signals are corrected in accordance with the surrounding visual environment such as indoor lighting and ambient light conditions.

JP 2010-250140 A

  In the video signal processing device described in Patent Document 1, since the gradation for displaying the image on the display device is used to correct the influence of the viewing environment, the expressiveness of the image that the user originally wants to view decreases. Sometimes.

  In view of the above-described problems, the present invention provides a display device that allows a user to easily grasp the distribution of external light reflected on the screen in order to suppress the influence of external light reflected on the screen. With the goal.

  In order to solve the above-described problems, a display device of the present invention includes a light emitting unit that emits light, a display unit that transmits light emitted from the light emitting unit and displays an image on a screen, and a light emitting unit. A detection unit that is arranged and detects the luminance of the external light transmitted through the display unit; and a generation unit that generates and outputs an image indicating the distribution of the external light based on a detection result of the detection unit. It is characterized by that.

  According to the display device of the present invention, an image indicating the distribution of external light incident on the acquired screen is generated using the optical sensor provided in the backlight. Therefore, in order to suppress the influence of the external light reflected on the screen, the user can easily grasp the distribution of the external light reflected on the screen.

It is a schematic diagram which shows an example of a structure of a display apparatus. It is a block diagram which shows the functional block of a control circuit board. It is a flowchart which shows the detection flow of the distribution of external light. It is a schematic diagram which shows operation | movement in the case of detecting the brightness | luminance of the light emitted from a green light source. It is a schematic diagram which shows the operation | movement in the case of detecting the brightness | luminance of external light. It is a schematic diagram which shows an example of the distribution image which the distribution image generation part produced | generated. It is a 1st schematic diagram which shows the screen at the time of displaying a distribution image and a display image. It is a 2nd schematic diagram which shows the screen at the time of displaying a distribution image and a display image. It is a schematic diagram which shows operation | movement in the case of acquiring the brightness | luminance of the blue component of external light. It is the graph which showed relative intensity. It is a 3rd schematic diagram which shows the screen at the time of displaying a distribution image and a display image. It is a table | surface which shows the table which shows the relationship between the color temperature of external light, and the kind of light source of external light. It is a schematic diagram which shows the distribution image which shows distribution of the red component, green component, and blue component of external light. It is a schematic diagram which shows the distribution image which shows distribution of the ratio of a light source luminance value and an external light luminance value.

[Example 1]
The video display apparatus according to the first embodiment of the present invention will be described below. In this embodiment, an example of a color video display device having a liquid crystal panel having a color filter and a backlight device using a light emitting diode will be described, but the configuration using another member having an equivalent function. There may be.

[Configuration of display device]
FIG. 1 is a schematic diagram illustrating an example of the configuration of the display device 1 according to the present embodiment. The display device 1 includes a backlight 10, a liquid crystal panel 20, an optical sensor 30, and a control circuit board 100. Hereinafter, the direction from the backlight 10 toward the liquid crystal panel 20 is defined as the front side, and the direction from the liquid crystal panel 20 toward the backlight 10 is defined as the back side.

  The backlight 10 is a light emitting device (illumination device) for irradiating the liquid crystal panel 20 with light. The backlight 10 includes a light source substrate 11, a diffusion plate 12, a light collecting sheet 13, a reflective polarizing film 14, and the like. The backlight 10 is a direct type backlight device having a light source on the back side of the liquid crystal panel 20.

  The light source substrate 11 is a substrate including a plurality of light sources that emit light. For example, it is assumed that the light source is a cluster light source composed of a red light source that emits red light, a green light source that emits green light, and a blue light source that emits blue light. The light source may be a light emitting diode (LED) that emits white light. As the light source, a cold cathode tube, an organic EL element, or the like can be used.

  The diffusing plate 12, the light collecting sheet 13, and the reflective polarizing film 14 are optical members that are arranged on the front side of the light source substrate 11 in parallel with the light source substrate 11 and optically change the light from the light source substrate 11. . For example, these optical members diffuse and reflect light emitted from the light source substrate 11. Thereby, the backlight 10 is functioned as a surface light source. Note that the optical member may include a member other than the configuration described above, or may not include at least one of the configurations described above.

  The liquid crystal panel 20 is a transmissive display panel that transmits light emitted from the backlight 10 and displays an image on a screen. The liquid crystal panel 20 has a plurality of pixels including an R sub-pixel that transmits red light, a G sub-pixel that transmits green light, and a B sub-pixel that transmits blue light, and controls the transmittance for each sub pixel. Suppose it is possible. The liquid crystal panel 20 includes a liquid crystal shutter 21 and a color filter 22 for each sub-pixel. The liquid crystal shutter 21 is a transmissive element whose transmittance can be controlled according to the driving voltage. The liquid crystal shutters 21r, 21g, and 21b are liquid crystal shutters corresponding to the red sub-pixel, the green sub-pixel, and the blue sub-pixel, respectively. The color filters 22r, 22g, and 22b are color filters corresponding to the red sub-pixel, the green sub-pixel, and the blue sub-pixel, respectively.

  The optical sensor 30 is a detection device that is disposed on the light source substrate 11 of the backlight 10 and can detect the luminance of incident light. A plurality of optical sensors 30 are arranged in a matrix on the light source substrate 11. Also. It is assumed that the optical sensor 30 is arranged so as to correspond to the entire screen. The optical sensor 30 can detect the luminance of light emitted from the light source of the backlight 10. In addition, the optical sensor 30 can detect the luminance of external light that has passed through the liquid crystal panel 20 and entered. The optical sensor 30 outputs the detection result as a sensor value.

  The backlight 10 has a plurality of light emitting areas, and includes at least one light source and at least one photosensor 30 in each light emitting area. One optical sensor 30 may be provided for a plurality of light emitting regions.

  The control circuit board 100 is a board that includes an electronic circuit for controlling the operation of the display device 1. The control circuit board 100 includes an electronic circuit and an arithmetic processing device (processor). The control circuit board 100 may include a power control board for supplying power for driving the display device 1.

  FIG. 2 is a block diagram illustrating functional blocks of the display device 1. The control circuit board includes a sensor value acquisition unit 101, a distribution image generation unit 102, a display control unit 103, an output unit 104, a mode selection unit 105, a control unit 106, and a memory 107.

  The sensor value acquisition unit 101 executes an acquisition process for acquiring a luminance detection value from the optical sensor 30. The distribution image generation unit 102 executes a process of generating a distribution image indicating at least one distribution of luminance or color of external light incident on the screen based on the luminance of external light acquired by the sensor value acquisition unit 101. The display control unit 103 executes control processing for controlling the backlight 10 and the liquid crystal panel 20 so that an image based on the input image is displayed on the screen of the liquid crystal panel 20.

  The output unit 104 executes processing for outputting the distribution image to an external display device. The mode selection unit 105 operates according to an instruction indicating whether or not to select a distribution image display mode for displaying a distribution image indicating at least one distribution of luminance or color of external light incident on the screen. Execute processing to output information. Further, the mode selection unit 105 selects a backlight monitoring mode for executing control (feedback control) for correcting the luminance of the light source of the backlight 10 using the luminance of the light source of the backlight 10 detected by the optical sensor 30. Is also possible.

  The control unit 106 is a control circuit for controlling operations of the sensor value acquisition unit 101, the distribution image generation unit 102, the display control unit 103, the output unit 104, and the mode selection unit 105. The control unit 106 is assumed to be a processor (CPU) that controls the operation of each functional block by reading and executing a program stored in the memory 107.

  The memory 107 is a storage medium that stores programs and parameters used by the control unit 106 for processing. The memory 107 is assumed to be a non-volatile storage medium such as a hard disk, for example. The memory 107 may store a display image for display together with the distribution image.

  In the backlight monitoring mode, the display control unit 103 sets each light emitting area according to the luminance of the light source of each light emitting area acquired by the sensor value acquiring unit 101 and the target value of the luminance of each light emitting area stored in the memory 107. This is an operation mode for correcting the luminance of the light source.

[Detection method and flow]
FIG. 3 is a flowchart showing a flow of detecting the distribution of external light. Hereinafter, the case where the display device 1 generates and displays a distribution image indicating the luminance distribution of external light incident on the screen will be described as an example.

  In step S301, the control unit 106 acquires information indicating the operation mode from the mode selection unit 105, and determines the operation mode. For example, in S301, it is determined whether or not the operation mode is the backlight monitoring mode.

  When it is determined in S301 that the operation mode is the backlight monitoring mode, in S302, the sensor value acquisition unit 101 performs a process of acquiring a luminance value corresponding to the luminance of the light source in each light emitting area from the optical sensor 30. Run. The sensor value acquisition unit 101 outputs the acquired luminance value to the display control unit 103.

  A process of acquiring the luminance value corresponding to the luminance of the light source in each light emitting area from the optical sensor 30 will be described with reference to FIG. FIG. 4 is a schematic diagram showing an operation when detecting the luminance of light emitted from a green light source. The display control unit 103 turns on the green light source and controls the transmittance of the liquid crystal shutter 21g of the corresponding G subpixel to a predetermined transmittance. At this time, part of the light diffused by the optical member and reflected to the light source substrate 11 side enters the optical sensor 30. The optical sensor 30 detects a part of the light emitted from the green light source, and outputs a luminance value corresponding to the luminance of the light emitted from the green light source. The sensor value acquisition unit 101 outputs the acquired luminance value to the display control unit 103. It should be noted that the luminance value acquisition process is similarly executed for the red light source and the blue light source.

  In step S <b> 303, the display control unit 103 executes feedback control for correcting the luminance of each light source based on the target value of the luminance value of each light source stored in the memory 107 and the luminance value acquired from the optical sensor 30. . By executing the above-described processing, even when the luminance of the light source of the backlight 10 changes with time, the luminance of light emitted from the backlight 10 and the luminance distribution can be optimally controlled.

  If it is determined in S301 that the operation mode is not the backlight monitoring mode, in S304, the sensor value acquisition unit 101 obtains a luminance value corresponding to the luminance of external light incident on the screen of the liquid crystal panel 20 from the optical sensor 30. Execute the acquisition process. The sensor value acquisition unit 101 outputs the acquired luminance value to the distribution image generation unit 102.

  FIG. 5 is a schematic diagram showing an operation when detecting the brightness of external light. The display control unit 103 performs control so that each light source is not turned on, and performs control so that the transmittance of the liquid crystal shutter corresponding to each color is approximately the same.

  At this time, external light incident on the screen from the outside of the liquid crystal panel 20 passes through the liquid crystal shutter 21 and the color filter 22, further passes through the optical member, and enters the optical sensor 30. The optical sensor 30 outputs a luminance value corresponding to the luminance of external light. The sensor value acquisition unit 101 outputs the acquired luminance value to the distribution image generation unit 102.

  In step S <b> 305, the distribution image generation unit 102 generates a distribution image indicating the distribution of external light based on the luminance value acquired from the optical sensor 30. FIG. 6 is a schematic diagram illustrating an example of a distribution image generated by the distribution image generation unit 102. For example, it is assumed that external light is strongly incident on the left side when the user views the screen of the liquid crystal panel 20 from the front. In this case, the left area of the distribution image is highlighted.

  The distribution image is assumed to be a gradation image in which the luminance value between the optical sensors 30 is complemented using the luminance value acquired from each optical sensor 30. The distribution image is not limited to a gradation image. The distribution image may indicate the brightness value of the external light acquired for each screen area corresponding to the light emitting area by a display method other than gradation.

  In step S306, the display control unit 103 controls the liquid crystal panel 20 and the backlight 10 so that an image obtained by combining the distribution image and the display image input in advance is displayed. FIG. 7 is a schematic diagram illustrating a screen when a distribution image and a display image are displayed. It is assumed that the display control unit 103 performs control so that a window for displaying a distribution image is displayed so as to be superimposed on a window for displaying a display image. The display control unit 103 may control the layout so that a window for displaying the distribution image and a window for displaying the display image are displayed side by side.

  Note that the layout of the window can be arbitrarily changed according to the user's preference and ease of use. For example, as shown in FIG. 8, when there is a band-like portion that is not used for display due to the relationship between the size of the display and the type of video signal, the date, time, temperature and humidity may be displayed on that portion.

  The control unit 106 may output the distribution image to an external display device via the output unit 104. The external display device displays an image based on the input distribution image, so that the user confirms the distribution of external light without affecting the display state of the display image being viewed on the display device 1. It becomes easy. Communication may be wireless or wired. For example, it is assumed that the external display device is an external device having a display unit, such as a remote controller that operates the display body, a tablet, a smartphone, or a mobile phone. An application for displaying a distribution image can be installed in advance in these external devices, and an image can be displayed based on the acquired distribution image.

  According to the above-described processing, the user can easily understand the distribution of the external light on the screen by displaying the image indicating the distribution of the external light incident on the screen. As a result, the user can change the orientation and position of the display device based on the image to suppress the influence of external light. Therefore, since the gradation used for correction by reflection of external light can be reduced, an image can be displayed with higher definition. In addition, since the brightness of the backlight is not automatically corrected due to correction by reflection of external light, the display state can be adjusted to a desired display state without using extra power. This is particularly effective for long-lasting batteries when used outdoors.

  Note that the luminance of light incident on the optical sensor 30 in the backlight monitoring mode is often higher than the luminance of light incident on the optical sensor 30 in the distribution image display mode. Therefore, the gain of the optical sensor 30 may be controlled to change between the backlight monitoring mode and the distribution image display mode. Specifically, the gain of the optical sensor 30 in the backlight monitoring mode is set lower than the gain of the optical sensor 30 in the distribution image display mode.

  When the lighting of the light source is controlled by PWM, it is also possible to detect the brightness of external light at the timing of turning off the PWM control. That is, it is possible to detect the brightness of external light using ambient light noise obtained in the extinguishing mode.

  In addition, when detecting a two-dimensional distribution of the display state with an optical sensor, when one or more environmental light sensors are separately provided in a frame portion or the like on the front surface of the display, and the type of environmental light is determined and the gain value is calculated. May be used.

  Note that a temperature sensor that measures the temperature in each light emitting region of the backlight 10 is further provided, and the distribution image generation unit 102 generates an image indicating the temperature distribution of the backlight 10 in addition to the luminance distribution of the external light. There may be.

[Example 2]
The display device of Example 1 displayed a distribution image indicating the luminance distribution of external light incident on the screen. By detecting the color temperature of the external light incident on the screen, the display device of Example 2 allows the user to easily confirm the influence of the external light on the display color.

  Since the device configuration of the display device of the second embodiment is the same as that of the first embodiment, the description thereof is omitted. The display device according to the second embodiment is different from the first embodiment in the external light distribution detection process (S304) in the flowchart of FIG. Specifically, the sensor value acquisition unit 101 acquires the luminance of the color component of the external light corresponding to the color component of the color filter, and acquires the color temperature of the external light.

  FIG. 9 is a schematic diagram illustrating an operation when acquiring the luminance of the blue component of external light. The display control unit 103 stops the light emission of each light source and opens the blue liquid crystal shutter 21b. As a result, the blue component light of the external light enters the optical sensor 30. When the sensor value acquisition unit 101 acquires the luminance value at this time, the luminance value Lb of the blue component of the external light can be acquired. Thereafter, similarly, the luminance value Lr of the red component of the external light and the luminance value Lg of the green component of the external light are sequentially acquired, whereby the luminance value of each single color can be acquired. In addition to the luminance value of the external light, the color temperature of the external light can be acquired from the luminance value of each color component.

Hereinafter, a method for obtaining the color temperature of external light will be described. With reference to MAX (Lr, Lg, Lb), which is the maximum value of each luminance value, the relative intensities Ir, Ig, Ib of each color are obtained by Equation 1.
Ir = Lr / MAX (Lr, Lg, Lb)
Ig = Lg / MAX (Lr, Lg, Lb) (Formula 1)
Ib = Lb / MAX (Lr, Lg, Lb)

Assuming that the main wavelengths λr, λg, and λb that each color filter transmits are, the combined wavelength λt is obtained by the following equation (2).
λt = λr × Ir + λg × Ig + λb × Ib (Formula 2)

FIG. 10 is a graph showing the wavelength on the horizontal axis and the relative intensity on the vertical axis. From this graph, the relative intensity I (λt) at λt is calculated. The color temperature T can be obtained by developing Equation 3, where I (λt), π is the pi, h is Planck's constant, c is the speed of light, and k is Boltzmann's constant.
I (λt) = 8πhc / {λt ⁵ × (exp (hc / (kTλt))) − 1} (Formula 3)

  The sensor value acquisition unit 101 outputs the color temperature T at the position of each optical sensor 30 obtained from Expression 2 to the distribution image generation unit 102.

  In S305, the distribution image generation unit 102 generates a distribution image indicating the luminance distribution of external light and the color temperature distribution.

  Note that the display control unit 103 may individually display an image showing the luminance distribution of external light and an image showing the chromaticity distribution, as shown in FIG.

  Note that the type of external light can be determined based on the acquired color temperature T. For example, it is possible to determine the light source of the external light incident on the screen from the table indicating the relationship between the color temperature of the external light and the type of the light source of the external light stored in the memory 107. FIG. 12 is a table showing a table showing the relationship between the color temperature of external light and the type of light source of external light. The display control unit 103 may control based on the color temperature T so as to display the determined type of the light source of external light together with the distribution image. Further, the distribution image generation unit 102 may generate a distribution image indicating the luminance distribution of the external light for each determined light source of the external light. Thus, the user can easily confirm the degree of influence on the image display for each light source of external light incident on the screen.

  According to the display device described in the present embodiment, the user can easily check the degree of color unevenness caused by external light reflected on the screen. Therefore, it becomes easier for the user to make adjustments for improving visibility and reducing image quality deterioration with respect to reflection of external light.

  The distribution image generation unit 102 may generate a distribution image for each color using the acquired red component, green component, and blue component of external light.

  FIG. 13 is a schematic diagram illustrating a screen on which a red distribution image, a green distribution image, and a blue distribution image are displayed. For example, the distribution image generation unit 102 generates a red gradation image indicating the luminance distribution of the red component of external light. Similarly, the distribution image generation unit 102 generates a green gradation image indicating the luminance distribution of the green component of external light and a blue gradation image indicating the luminance distribution of the blue component of external light.

[Example 3]
When the luminance of light emitted from the backlight 10 to the area is low with respect to the external light incident on the screen area, the image displayed in the area is easily affected by the external light. The display device according to the third embodiment displays the distribution image indicating the ratio between the luminance at which the external light is reflected on the screen and the luminance of the backlight 10, thereby more specifically affecting the image display due to the reflection of the external light. Can be confirmed.

  Since the configuration of the display device according to the third embodiment is the same as that of the first and second embodiments, the description thereof is omitted.

  In the third embodiment, the mode selection unit 105 selects the backlight monitoring mode and the distribution image generation mode at least once. Thereby, the sensor value acquisition unit 101 sets the luminance value (light source luminance value) corresponding to the luminance of the light emitted from the light source in each light emitting region and the luminance of the external light applied to the screen region corresponding to each light emitting region. A corresponding luminance value (external light luminance value) can be acquired.

  Furthermore, the distribution image generation unit 102 generates a distribution image based on the ratio between the light source luminance value and the external light luminance value in each light emitting region.

  FIG. 14 is a schematic diagram illustrating an example of displaying an external light irradiation state acquired by the display device according to the third embodiment. FIG. 14A is a schematic diagram showing the arrangement of the optical sensors 30 arranged on the light source substrate 11. It is assumed that the optical sensor 30 is provided for each light emitting region. The sensor value acquisition unit 101 acquires the light source luminance value of each light emitting area and the external light luminance value incident on each light emitting area from each optical sensor 30. For example, it is assumed that the luminance of the light source in each light emitting area of the backlight 10 is almost the same.

  FIG. 14B is a schematic diagram showing a distribution image when the luminance of incident external light is low. As shown in FIG. 13B, when the luminance of the incident external light is low, the light source luminance value is sufficiently larger than the external light luminance value, so that the distribution is uniform.

  FIG. 14C is a schematic diagram illustrating a distribution image in a case where the incident external light has a high luminance area. As shown in FIG. 14C, the ratio between the light source luminance value and the external light luminance value changes between the region where the luminance of the incident external light is high and the region where the external light is not high, resulting in an uneven distribution.

  The display control unit 103 controls the backlight 10 and the liquid crystal panel 20 to display the generated distribution image on the screen.

  With the above-described control, the user can easily confirm the influence on the display image due to external light incident on the screen.

  The distribution image generation unit 102 may generate a distribution image based on the difference between the light source luminance value and the external light luminance value. Thereby, only external light can be separated and displayed.

(Other examples)
The present invention supplies a program that realizes one or more functions of the above-described embodiments to a system or apparatus via a network or a storage medium, and one or more processors in the computer of the system or apparatus read and execute the program This process can be realized. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.

DESCRIPTION OF SYMBOLS 1 Display apparatus 10 Backlight 20 Liquid crystal panel 30 Optical sensor 100 Control circuit board 102 Distribution image generation part

Claims (16)

A light emitting means for irradiating light;
Display means for transmitting light emitted from the light emitting means and displaying an image on a screen;
A detecting means disposed on the light emitting means for detecting at least one of luminance and color of external light transmitted through the display means;
Generating means for generating and outputting a distribution image indicating a distribution of at least one of luminance and color of the external light based on a detection result of the detecting means;
A display device comprising: The detection means includes
The light transmittance of the display means is controlled to a predetermined transmittance, and the distribution of external light transmitted through the display means is detected in a state where the light emitting means is not irradiating light. The display device according to claim 1.   The display device according to claim 1, wherein the detection unit includes a plurality of optical sensors.   4. The display control unit according to claim 1, further comprising a display control unit configured to control the display unit to display the distribution image generated by the generation unit on the display unit. 5. Display device.   The display device according to claim 1, further comprising an output unit that outputs the distribution image generated by the generation unit to another display device different from the display device. .   6. The distribution image according to claim 1, wherein the distribution image is a gradation image corresponding to a distribution of at least one of luminance and color of external light on the screen of the display unit. Display device.   The distribution image includes a red distribution image indicating a luminance distribution of red light in the external light on the screen of the display means, and a luminance distribution of green light in the external light on the screen of the display means. 7. A green distribution image indicating a luminance distribution of blue light out of the external light on the screen of the display unit, and a blue distribution image indicating a luminance distribution of blue light. Item 1. A display device according to item 1. The detecting means includes a plurality of temperature sensors for detecting the temperature of the light emitting means,
The display device according to claim 1, wherein the generation unit generates an image indicating a temperature distribution of the light emitting unit. A light emitting means for irradiating light, a display means for transmitting light emitted from the light emitting means to display an image on a screen, and a luminance and a color of external light disposed on the light emitting means and transmitted through the display means A detection means for detecting at least one of the display device and the control method of the display device,
A detection step of detecting at least one of the luminance and color of the external light via the detection means; a generation step of generating and outputting a distribution image indicating a distribution of at least one of the luminance and color of the external light;
A control method for a display device, comprising:   The detection step detects the distribution of external light transmitted through the display means in a state where the light transmittance of the display means is controlled to a predetermined transmittance and the light emitting means is not irradiating light. The display apparatus control method according to claim 9.   11. The display device control method according to claim 9, wherein the detection unit includes a plurality of optical sensors.   12. The display control process according to claim 9, further comprising a display control process for controlling the display unit so that the display unit displays the distribution image generated in the generation process. A control method of the display device described.   The display according to any one of claims 9 to 12, further comprising an output step of outputting the distribution image generated in the generation step to another display device different from the display device. Control method of the device.   14. The distribution image according to claim 9, wherein the distribution image is a gradation image corresponding to a distribution of at least one of luminance and color of external light on the screen of the display unit. Display device control method.   The distribution image includes a red distribution image indicating a luminance distribution of red light in the external light on the screen of the display means, and a luminance distribution of green light in the external light on the screen of the display means. 15. The green distribution image indicating the brightness distribution of the blue light among the external light on the screen of the display unit and the blue distribution image indicating the brightness distribution of the blue light. 2. A method for controlling a display device according to item 1. The detecting means includes a plurality of temperature sensors for detecting the temperature of the light emitting means,
The display device control method according to claim 9, wherein the generation step generates an image showing a temperature distribution of the light emitting means.